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| Number | Title | Issue Date |
| 7714591 | Apparatus and methods for linearizing piezoresistive wheatstone bridges A pressure sensing apparatus including: at least one deflectable diaphragm having a center, wherein each diaphragm supports: at least one positive piezoresistive gauge and at least one negative piezoresistive gauge coupled in series across a voltage differential in ... | 05/11/2010 |
| 7535235 | Integrated digital thermal air flow sensor An air flow sensor includes a sensor element and a microcontroller, employing a PWM signal to drive the sensor element. Signals from the sensor element are processed by the microcontroller inside the sensor, resulting in continuous readings of air velocity and air t... | 05/19/2009 |
| 7322248 | Pressure gauge for organic materials A vacuum gauge of the Pirani type for measuring the pressure of vaporized organic or inorganic material used in forming a layer of a device, comprising: an extended filament having a thickness of 5 microns or less and having a temperature coefficient of resistance g... | 01/29/2008 |
| 7318345 | Method of measuring the height of a liquid using a high-frequency line probe The invention relates to a method of measuring the height of a liquid using a high-frequency line probe. According to the invention, a comparison is made, on an electric circuit (3) which is supplied with high-frequency alternating current, between the impeda... | 01/15/2008 |
| 7309994 | Integrated directional bridge A directional bridge for measuring propagated signals to and from a source device to a load device where both the source device and load device are in signal communication with the directional bridge is disclosed. The directional bridge may include a first bridge ci... | 12/18/2007 |
| 7307430 | Open offset canceling method and an impedance measuring apparatus using the method A method for finding the impedance of a device under test using an impedance measuring apparatus having a modem-type auto-balancing bridge, two or more measurement signals, each of which has a different phase with respect to the reference signals supplied to the mod... | 12/11/2007 |
| 7279906 | Sensor-emulator evaluation module and method A bridge sensor emulator includes a first emulation circuit programmable to emulate an output signal of the bridge circuit under 11 conditions each including a different combination of applied stimulus and temperature. A second emulation circuit is programmable to e... | 10/09/2007 |
| 7205781 | Mass air flow circuit having pulse width modulation feedback control A circuit for measuring the mass air flow rate through a duct is disclosed. The circuit includes a bridge circuit, a first amplifier, an oscillator, a comparator and a switch. The bridge circuit has a plurality of resistors arranged to output first and second bridge... | 04/17/2007 |
| 7141991 | Instrumentation current loop An instrumentation current loop, including a transducer having transducer output terminals. A power source is connected in series to the transducer. A bridge has a first arm and a second arm extending between a pair of input terminals, where the input terminals of t... | 11/28/2006 |
| 7121148 | Force measuring transducer The invention relates to a force measuring transducer with an oscillator (1) with an inductor (2) formed by a primary winding and a gauge (11) with a secondary winding (30) which is connected electroconductively to the gauge (11) a... | 10/17/2006 |
| 7109723 | Bridge type phase detection device A bridge type phase detection device comprises one or more than one transformer, a plurality of tubes, a voltage-detecting protection circuit and a first, second and third impedance, wherein a first tube of said plurality of tubes has a phase opposite to that of a s... | 09/19/2006 |
| 7102362 | Integrated circuit for testing circuit components of a semiconductor chip An integrated circuit includes a first circuit component, a second circuit component, and an external terminal for making contact with the circuit. The first circuit component is connected to the external terminal via the second component. A bridging circuit connect... | 09/05/2006 |
| 7088108 | Method for detecting an offset drift in a wheatstone measuring bridge In a method for detecting an offset drift in a resistive Wheatstone measuring bridge, a switch is made between a measuring mode and a testing mode without interfering in the internal structure of the measuring bridge. In testing mode, two sensor resistors that act i... | 08/08/2006 |
| 7085657 | Signal processing unit for a pressure switch or the like A signal processing unit for a pressure switch or the like, comprising a sensor element, such as a strain gauge bridge, to supply an analog electrical signal that corresponds to a pressure; a signal processing unit which is connected downstream of the sensor element... | 08/01/2006 |
| 7064558 | Millivolt output circuit for use with programmable sensor compensation integrated circuits An output sensor apparatus, system, and method including a circuit having a plurality of bridge resistors and one or more connecting resistors coupled to the plurality of bridge resistors. Additionally, a programmable amplifier can be coupled to the connecting resis... | 06/20/2006 |
| 7030600 | Broadband microwave power sensor A circuit for sensing radio frequency energy. The circuit includes a Wheatstone bridge having at least one element thereof thermally responsive to the radio frequency energy passing therethough differently from radio frequency energy passing though at least one othe... | 04/18/2006 |
| 7031863 | Variable condition responsive sense system and method Signal conditioning of multiple sense elements is shown for providing information to a system requiring high accuracy and robust fault coverage. A first signal conditioning ASIC (10) pre-conditions the sense element data and a second system control ASIC (1... | 04/18/2006 |
| 6956380 | Narrow-band amplifier and impedance-measuring apparatus An impedance measuring apparatus comprising an automatic balanced bridge has four numerically controlled oscillators that supply sine-wave signals and cosine-wave signals to the quadrature detector and vector modulator of the narrow-band amplifier inside the automat... | 10/18/2005 |
| 6819118 | Sensing device A sensing device of the present invention includes a first resistive branch having first and second resistors connected in series, a second resistive branch comprising third and fourth resistors connected in series and arranged in parallel with the first resistive b... | 11/16/2004 |
| 6765391 | Low cost asic architecture for safety critical applications monitoring an applied stimulus An ASIC (14, 14′, 14″) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge (12) in separate conditioning paths. Each path is provided with a bridge supply voltage (VHB1, VHB2) which can serve as ... | 07/20/2004 |
| 6727709 | Vacuum gauge using peltier tip A thermal conduction vacuum gauge using a Peltier tip is provided. The vacuum gauge for measuring the pressure in a vacuum chamber includes: a signal generator that drives an electric current; an ammeter connected to the signal generator for measuring the current; a... | 04/27/2004 |
| 6646446 | Method and apparatus for fault detection in a resistive bridge sensor A full Wheatstone bridge sensor has conditioning electronics of an ASIC connected thereto. Two independently controlled diagnostic switches (S1, S2) in the ASIC are commonly connected to one of the bridge output nodes. The first diagnostic switch connects... | 11/11/2003 |
| 6486679 | Wide-band ratiometric radio frequency bridge A radio frequency bridge, useful for measuring complex values of an unknown impedance or associated complex reflection coefficient and VSWR value, which comprises an rf source, a novel asymmetrical bridge, a measuring device (comprising two logarithmic am... | 11/26/2002 |
| 6452372 | Duet jfet rf oscillator-detector for flow cytometer A junction field effect transistor (JFET) RF oscillator-detector circuit generates an RF signal for an apparatus for conducting electrical measurements of particles contained in a carrier fluid passing through an aperture in a cytometer flow cell. The JFE... | 09/17/2002 |
| 6433554 | Method and apparatus for in-range fault detection of condition responsive sensor An in-range fault detection system for a full wheatstone bridge element (12) having piezoresistive elements (R1, R2, R3, R4) has bridge outputs (INP, INM) connected to measuring means in the form of a first circuit portion (13) to provide a common mode vo... | 08/13/2002 |
| 6405578 | Magnetic oxygen analyzer A magnetic oxygen analyzer which employes a detector comprising a magnetic pole, heat generator arranged in a non-uniform magnetic field where the intensity of a magnetic field produced by the magnetic pole varies, and a magnetic wind sensor disposed to n... | 06/18/2002 |
| 6323632 | Solid state RF oscillator-detector for flow cytometer A junction field effect transistor (JFET) RF oscillator-detector circuit generates an RF signal for an apparatus for conducting electrical measurements of particles contained in a carrier fluid passing through an aperture in a cytometer flow cell. The JFE... | 11/27/2001 |
| 5831146 | Gas sensor with multiple exposed active elements A combustible gas detector or sensor having catalytic coated resistance sensing elements that uses a wheatstone bridge to sense the presence and concentration of any combustible gases in a gas stream that chemically react with such catalytic coatings. Whe... | 11/03/1998 |
| 5804978 | Circuit for feeding a Wheatstone Bridge with a rectangular waveform voltage The circuit for feeding a Wheatstone Bridge (DMS 1 . . . DMS 4) with a rectangular waveform alternating voltage which is derived from a single DC reference voltage, consists of a first operational amplifier (V 1) whose positive input is connected to the D... | 09/08/1998 |
| 5724387 | Cable loss simulator for serial digital source using a passive network A cable loss simulator for a serial digital signal source adapts a constant resistance, bridged-T passive network to simulate the frequency-loss characteristics of a reference coaxial cable. The cable loss simulator is selectively coupled into the output ... | 03/03/1998 |
| 5583442 | Differential voltage monitor using a bridge circuit with resistors on and off of an integrated circuit A differential voltage monitor is shown using a resistive bridge to produce a sample value representing that differential voltage. A portion of the resistive bridge is located on an IC and a portion is external to the IC. The object is to compare the diff... | 12/10/1996 |
| 5485100 | Automatically balanced and tested bridge measurement circuit, and method The output of a bridge measurement circuit is sampled at a time when there is no desired, or expected, bridge output signal, and a balance voltage applied to the bridge measurement circuit is automatically adjusted such that the sample bridge output signa... | 01/16/1996 |
| 5398194 | Electronic sensing circuit using piezoresistors An electronic sensing circuit, which can be used in place of a linear variable differential transformer (LVDT) has four piezoresistor elements in a Wheatstone bridge configuration. A source voltage is applied across a first pair of bridge points, and the ... | 03/14/1995 |
| 5311140 | Circuit for measuring variations in the capacitance of a variable capacitor using a continuously rebalanced detection bridge A circuit for measuring variations in the capacitance of a variable capacr forming part of a sensor includes an oscillator which generates an alternating signal which is supplied to two branches of a detection bridge. The first branch includes the variab... | 05/10/1994 |
| 5279145 | Heater control device for an air-fuel ratio sensor A heater control device for an air-fuel ratio sensor which comprises: an air-fuel ratio sensor comprising a sensor element which detects an air-fuel ratio state of exhaust gas of an engine, and a heater which heats the sensor elements; a heater current fl... | 01/18/1994 |
| 5264798 | Autonulling AC bridge using differential and integration feedback A self-contained autonulling bridge circuit based on phase-sensitive deteon of an impedance to be measured is described. The system utilizes a feedback structure to control a variable impedance in order to establish the null of the bridge. The system uti... | 11/23/1993 |
| 5063352 | Circuit arrangement with a flow probe operated in a bridge circuit In the case of a circuit arrangement with a flow probe operated in a bridge circuit, a device for determining bridge balance, which controls a triggering circuit which can be supplied by an oscillator and controls a switching device for the power supply o... | 11/05/1991 |
| 4837501 | Apparatus for measuring differential impedances An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together a... | 06/06/1989 |
| 4528499 | Modified bridge circuit for measurement purposes In a four element modified bridge circuit for measurement purposes at least one impedance element is variable according to a magnitude to be measured. Via a first operational amplifier a DC supply voltage is connected across two bridge nodes facing each o... | 07/09/1985 |
| 4229692 | Linear low drift bridge amplifier A transducer bridge amplifier system includes a first operational amplifier having positive and negative inputs connected, respectively, to first and second output nodes of the bridge. The output of the operational amplifier is connected to a third node o... | 10/21/1980 |
